Static Difficulty can be defined through the password field.
Using d=64 as password would give you a static diff of 64 for your miner, it doesn't matter what your workerpassword is defined to.

You can use these commands also in a .bat File ! You then need to change "-u Weblogin.Worker -p Worker password" to reflect your own account. Eg, "-u Steve.StevesWorker -p StevesWorkerPassword" then go to "File > Save as" and save the file as "RunMe.bat" in the same folder containing your miners application files. You are now ready to mine, double click on "RunMe.bat" to start mining. If you want, you can create additional workers with usernames and passwords of your choice here